Freescale Semiconductor, Inc.
System Integration Module (SIM)
Program Exception Control
CLI
BACKGROUND
ROUTINE
LDA #$FF
INT1
PSHH
INT1 INTERRUPT SERVICE ROUTINE
PULH
RTI
INT2
PSHH
INT2 INTERRUPT SERVICE ROUTINE
PULH
RTI
Figure 9-11. Interrupt Recognition Example
9.6.2 Reset
All reset sources always have higher priority than interrupts and cannot
be arbitrated.
9.6.3 Break Interrupts
The break module can stop normal program flow at a software-
programmable break point by asserting its break interrupt output. See
Section 12. Break Module. The SIM puts the CPU into the break state
by forcing it to the SWI vector location. Refer to the break interrupt
subsection of each module to see how each module is affected by the
break state.
9.6.4 Status Flag Protection in Break Mode
The SIM controls whether status flags contained in other modules can
be cleared during break mode. The user can select whether flags are
protected from being cleared by properly initializing the break clear flag
enable bit (BCFE) in the SIM break flag control register (SBFCR).
MC68HC908AS60 — Rev. 1.0
Technical Data
System Integration Module (SIM)
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